Method of implanting a fluid injection port

ABSTRACT

A method for implanting an injection port within a patient. The method involves providing a port having a housing with a closed distal end, a open proximal end, a fluid reservoir therebetween, a needle penetrable septum attached to the housing about the opening, and at least one attachment mechanism mounted to the housing at a pivot point along an outer periphery of the housing. The attachment mechanism is an arcuate hook pivotable with respect to the housing, the arcuate hook having a length extending substantially at least 180° about the pivot point. The method further involves placing the distal end of the port adjacent tissue, and rotating the arcuate hook at least 180 degrees so that a free end of the hook extends into tissue and back out again.

FIELD OF THE INVENTION

The present invention has application in conventional endoscopic andopen surgical instrumentation as well as application in robotic-assistedsurgery. The present invention has even further relation to adjustablesurgically implantable bands, such as gastric bands for the treatment ofobesity.

BACKGROUND OF THE INVENTION

The percentage of the world's population suffering from morbid obesityis steadily increasing. Severely obese persons are susceptible toincreased risk of heart disease, stroke, diabetes, pulmonary disease,and accidents. Because of the effect of morbid obesity to the life ofthe patient, methods of treating morbid obesity are being researched.

Numerous non-operative therapies for morbid obesity have been tried withvirtually no permanent success. Dietary counseling, behaviormodification, wiring a patient's jaws shut, and pharmacological methodshave all been tried, and failed to correct the condition. Mechanicalapparatuses for insertion into the body through non-surgical means, suchas the use of gastric balloons to fill the stomach have also beenemployed in the treatment of the condition. Such devices cannot beemployed over a long term, however, as they often cause severeirritation, necessitating their periodic removal and hence interruptionof treatment. Thus, the medical community has evolved surgicalapproaches for treatment of morbid obesity.

Most surgical procedures for treatment of morbid obesity may generallybe classified as either being directed toward the prevention ofabsorption of food (malabsorption), or restriction of stomach to makethe patient feel full (gastric restriction) The most commonmalabsorption and gastric restriction technique is the gastric bypass.In variations of this technique, the stomach is horizontally dividedinto two isolated pouches, with the upper pouch having a small foodcapacity. The upper pouch is connected to the small intestine, orjejunum, through a small stoma, which restricts the processing of foodby the greatly reduced useable stomach. Since food bypass much of theintestines, the amount of absorption of food is greatly reduced.

There are many disadvantages to the above procedure. Typically the abovementioned procedure is performed in an open surgical environment.Current minimally invasive techniques are difficult for surgeons tomaster, and have many additional drawbacks. Also, there is a high levelof patient uneasiness with the idea of such a drastic procedure which isnot easily reversible. In addition, all malabsorption techniques carryongoing risks and side effects to the patient, including malnutritionand dumping syndrome.

Consequently, many patients and physicians prefer to undergo a gastricrestriction procedure for the treatment of morbid obesity. One of themost common procedures involves the implantation of an adjustablegastric band. Examples of an adjustable gastric band can be found inU.S. Pat. Nos. 4,592,339 issued to Kuzmak; RE 36176 issued to Kuzmak;5,226,429 issued to Kuzmak; 6,102,922 issued to Jacobson and 5,601,604issued to Vincent, all of which are hereby incorporated herein byreference. In accordance with current practice, a gastric band isoperatively placed to encircle the stomach. This divides the stomachinto two parts with a stoma in-between. An upper portion, or a pouch,which is relatively small, and a lower portion which is relativelylarge. The small partitioned portion of the stomach effectively becomesthe patients new stomach, requiring very little food to make the patientfeel full.

Once positioned around the stomach, the ends of the gastric band arefastened to one another and the band is held securely in place byfolding a portion of the gastric wall over the band and closing thefolded tissue with sutures placed therethrough thereby preventing theband from slipping and the encircled stoma from expanding. Gastric bandstypically include a flexible substantially non-extensible portion havingan expandable, inflatable portion attached thereto. The inflatableportion is in fluid communication with a remote injection site, or port.Injection or removal of an inflation fluid into or from the interior ofthe inflatable portion is used to adjust the size of the stoma eitherduring or following implantation. By enlarging the stoma, the patientcan eat more food without feeling as full, but will not lose weight asfast. By reducing the size of the stoma, the opposite happens.Physicians regularly adjust the size of stoma to adjust the rate ofweight loss.

For most fluid injection ports for the above described bands areattached underneath the skin to the fascia of a patient. Such ports areoften provided with suture holes and the port is sutured to the tissue.However, alternative means of attaching the port to the patient, such asusing integral hooks, can be used as well. Such other means forattaching the port to a patient are described in commonly assigned andcopending U.S. patent application Ser. Nos. 10/741,785 filed Dec. 19,2003; 60/478,763 filed Dec. 19, 2003; 10/741,868 filed Dec. 30, 2003;all of which are hereby incorporated herein by reference.

SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided a method forimplanting an injection port within a patient. The method involvesproviding a port having a housing with a closed distal end, a openproximal end, a fluid reservoir therebetween, a needle penetrable septumattached to the housing about the opening, and at least one attachmentmechanism mounted to the housing at a pivot point along an outerperiphery of the housing. The attachment mechanism is an arcuate hookpivotable with respect to the housing, the arcuate hook having a lengthextending substantially at least 180° about the pivot point. The methodfurther involves placing the distal end of the port adjacent tissue, androtating the arcuate hook at least 180 degrees so that a free end of thehook extends into tissue and back out again.

DETAILED DESCRIPTION OF THE DRAWINGS

The novel features of the invention are set forth with particularity inthe appended claims. The invention itself, however, both as toorganization and methods of operation, together with further objects andadvantages thereof, may best be understood by reference to the followingdescription, taken in conjunction with the accompanying drawings inwhich:

FIG. 1 is a perspective view of a surgically implantable fluid port madein accordance with the present invention, showing the port attached toan adjustable gastric band.

FIG. 2 is a perspective view of a surgically implantable fluid port madein accordance with the present invention.

FIG. 3 is a cross section of the port shown in FIGS. 1 and 2, takenalong line 3-3 in FIG. 1.

FIG. 4 is a view similar to that of FIG. 3 but showing the fluid portimplanted within a patient.

DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawings wherein like numerals indicate the sameelements throughout the views, as stated above there is shown in FIG. 1an adjustable gastric band 1 of the type described in the abovementioned incorporated references. Band 1 is implanted within a body ofa patient to surround the stomach 12. The inflatable portion of the bandis in fluid communication with injection port 10 via a catheter tube 52.Tube 52 has a proximal end 53 attached to the port 10 and a distal end55 attached to adjustable gastric band 1. Port 10 can be used for a widerange of devices in the medical field and not only for gastric bands.For example the port can also used for vascular access for drugdelivery.

As seen from FIGS. 2 and 3, surgically implantable injection port 10includes a housing 12. Housing 12 can be made from any number ofmaterials including stainless steel, titanium, or polymeric materials.Housing 12 has a distal back portion or closed distal end 14 and aperimeter wall portion 16 extending proximally from the back portion 14at an angle. Wall portion 16 defines a proximal opening or open proximalend 18, and a fluid reservoir 20 between opening 18 and back portion 14.The port includes a needle penetrable septum 22 attached to the housingabout the opening 18 so as to cover the opening and seal the reservoir20. Septum 22 can be made from any number of materials includingsilicone. Septum 22 is preferably placed in a proximal enough positionsuch that the depth of the reservoir 20 is sufficient enough to exposethe open tip of a needle, such as a Huber needle, so that fluid transfercan take place. Septum 22 is preferably arranged so that it will selfseal after being punctured by a needle and the needle is withdrawn. Inone embodiment, the septum is made from silicone which is undercompression when attached to the housing. Port 10 further includes acatheter tube connection member 30, in fluid communication withreservoir 20.

As seen from the figures, port 1 one or more attachment mechanisms 70.The figures herein show three attachment mechanisms all substantiallyidentical and equally spaced from each other. Attachment mechanisms 70are mounted to the housing 12 at a pivot point 80 along an outerperiphery 13 of the housing 12. As seen from the figures, attachmentmechanisms 70 are arcuate hooks pivotable with respect to the housing.Attachment mechanisms 70 have an arcuate length L extendingsubstantially greater than 90°, and preferably at least 180° about thepivot point. Implantable surgical injection port 10 has an undeployedposition, shown as a solid line in FIG. 3, and a deployed position,shown as the phantom line in FIG. 3 and in FIG. 4, wherein the port isattached to tissue. Attachment mechanisms 70 can be made from any numberof materials including stainless steel, titanium or absorbable materialssuch as polyglactin and poliglecaprone.

Attachment mechanism 70 has a fixed end 72 pivotally attached to thehousing 12 at pivot point 80. The design allows a surgeon to use forcepsand drive the fastener through the tissue until the free end 74 restsagainst the flat 75. In this way the patient is protected from the sharpend of the tip. Attachment mechanism 70 also includes a free end 74which has a sharp or pointed configuration. Housing 12 further includesat least one recessed portion 15 along its distal end 14. Recessedportion 15 is designed to receive the free end 74 of attachmentmechanisms 70 when the port 1 is in its deployed position. This designprevents any exposure of the sharp free end to tissue after the port hasbeen implanted.

The above described 180° hook or attachment mechanisms provideadvantages over prior 90° or less hooks. As seen from FIG. 4, the abovedescribed attachment mechanism allows the hook to engage a greater areaof tissue, and allows for two locking points, entry into and then out ofthe fascia. This provides for better sacrament of the port to thetissue. Further no “sharp” is exposed to the patient. A furtheradvantage of the fastener configuration is that the fastener follows aconstant radius when pushing through the tissue. By maintaining aconstant radius the fastener never induces a compressive force onto thefascia. This should minimize pain because the fastener is not“compressing or squeezing” nerves.

In practice, the physician would create an incision in the skin 110 of apatient to expose the fascia according to well known surgicaltechniques. Thereafter, as seen from FIG. 4, the port 1 could be placedagainst the fascia 100 of the patient with the port in its undeployedposition. Thereafter, the physician could rotate, manually or otherwise,the attachment mechanism substantially greater than 90° and preferablyat least 180° so that the hook enters and then exits the fascia. Thedesign allows a surgeon to use forceps and drive the fastener throughthe tissue until the free end 74 rests against the flat 75. In this waythe patient is protected from the sharp end of the tip. This could bedone for each attachment mechanism on the device. Thereafter, thecatheter tube 52 would be connected to connection member 30, and thepatient is sewn up.

It will become readily apparent to those skilled in the art that theabove invention has equally applicability to other types of implantablebands. For example, bands are used for the treatment of fecalincontinence. One such band is described in U.S. Pat. No. 6,461,292which is hereby incorporated herein by reference. Bands can also be usedto treat urinary incontinence. One such band is described in U.S. PatentApplication 2003/0105385 which is hereby incorporated herein byreference. Bands can also be used to treat heartburn and/or acid reflux.One such band is described in U.S. Pat. No. 6,470,892 which is herebyincorporated herein by reference. Bands can also be used to treatimpotence. One such band is described in U.S. Patent Application2003/0114729 which is hereby incorporated herein by reference.

While preferred embodiments of the present invention have been shown anddescribed herein, it will be obvious to those skilled in the art thatsuch embodiments are provided by way of example only. Numerousvariations, changes, and substitutions will now occur to those skilledin the art without departing from the invention. For example, as wouldbe apparent to those skilled in the art, the disclosures herein haveequal application in robotic-assisted surgery. In addition, it should beunderstood that every structure described above has a function and suchstructure can be referred to as a means for performing that function.Accordingly, it is intended that the invention be limited only by thespirit and scope of the appended claims.

1. A method for implanting an injection port within a patient, saidmethod comprising: a. providing a port comprising a housing having aclosed distal end, a open proximal end, a fluid reservoir therebetween,a needle penetrable septum attached to said housing about said opening,and at least one attachment mechanism mounted to said housing at a pivotpoint along an outer periphery of said housing, said attachmentmechanism comprising an arcuate hook pivotable with respect to saidhousing, said arcuate hook having a length extending substantially atleast 180° about said pivot point; b. placing said distal end of saidport adjacent tissue; and c. rotating said arcuate hook at least 180degrees so that a free end of said hook extends into tissue and back outagain.
 2. The method of claim 1 further comprising the step of attachingsaid port to a catheter tube.
 3. The method of claim 2 furthercomprising the step of adding fluid to said port.
 4. The method of claim2 further comprising the step of withdrawing fluid from said port.
 5. Amethod for implanting an injection port within a patient, said methodcomprising: a. providing a port comprising a housing having a closeddistal end, a open proximal end, a fluid reservoir therebetween, aneedle penetrable septum attached to said housing about said opening,and at least one attachment mechanism mounted to said housing at a pivotpoint along an outer periphery of said housing, said attachmentmechanism comprising an arcuate hook pivotable with respect to saidhousing, said arcuate hook having a length extending substantially atleast 180° about said pivot point; b. placing said distal end of saidport adjacent tissue; c. rotating said arcuate hook at least 180 degreesso that a free end of said hook extends into tissue and back out again;and d. connecting said port to an adjustable gastric band via a cathetertube.
 6. The method of claim 5 further comprising the step of addingfluid to said port.
 7. The method of claim 5 further comprising the stepof withdrawing fluid from said port.